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cpython/Lib/test/test_import.py
Antoine Pitrou d35cbf6e61 Merged revisions 68360-68361 via svnmerge from 
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r68360 | antoine.pitrou | 2009-01-06 19:10:47 +0100 (mar., 06 janv. 2009) | 7 lines

  Issue #1180193: When importing a module from a .pyc (or .pyo) file with
  an existing .py counterpart, override the co_filename attributes of all
  code objects if the original filename is obsolete (which can happen if the
  file has been renamed, moved, or if it is accessed through different paths).
  Patch by Ziga Seilnacht and Jean-Paul Calderone.
........
  r68361 | antoine.pitrou | 2009-01-06 19:34:08 +0100 (mar., 06 janv. 2009) | 3 lines

  Use shutil.rmtree rather than os.rmdir.
........
2009-01-06 19:02:24 +00:00

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import unittest
import os
import random
import shutil
import sys
import py_compile
import warnings
import imp
import marshal
from test.support import unlink, TESTFN, unload, run_unittest
def remove_files(name):
for f in (name + ".py",
name + ".pyc",
name + ".pyo",
name + ".pyw",
name + "$py.class"):
if os.path.exists(f):
os.remove(f)
class ImportTest(unittest.TestCase):
def testCaseSensitivity(self):
# Brief digression to test that import is case-sensitive: if we got this
# far, we know for sure that "random" exists.
try:
import RAnDoM
except ImportError:
pass
else:
self.fail("import of RAnDoM should have failed (case mismatch)")
def testDoubleConst(self):
# Another brief digression to test the accuracy of manifest float constants.
from test import double_const # don't blink -- that *was* the test
def testImport(self):
def test_with_extension(ext):
# ext normally ".py"; perhaps ".pyw"
source = TESTFN + ext
pyo = TESTFN + ".pyo"
if sys.platform.startswith('java'):
pyc = TESTFN + "$py.class"
else:
pyc = TESTFN + ".pyc"
f = open(source, "w")
print("# This tests Python's ability to import a", ext, "file.", file=f)
a = random.randrange(1000)
b = random.randrange(1000)
print("a =", a, file=f)
print("b =", b, file=f)
f.close()
if TESTFN in sys.modules:
del sys.modules[TESTFN]
try:
try:
mod = __import__(TESTFN)
except ImportError as err:
self.fail("import from %s failed: %s" % (ext, err))
self.assertEquals(mod.a, a,
"module loaded (%s) but contents invalid" % mod)
self.assertEquals(mod.b, b,
"module loaded (%s) but contents invalid" % mod)
finally:
unlink(source)
unlink(pyc)
unlink(pyo)
del sys.modules[TESTFN]
sys.path.insert(0, os.curdir)
try:
test_with_extension(".py")
if sys.platform.startswith("win"):
for ext in ".PY", ".Py", ".pY", ".pyw", ".PYW", ".pYw":
test_with_extension(ext)
finally:
del sys.path[0]
def testImpModule(self):
# Verify that the imp module can correctly load and find .py files
import imp
x = imp.find_module("os")
os = imp.load_module("os", *x)
def test_module_with_large_stack(self, module='longlist'):
# create module w/list of 65000 elements to test bug #561858
filename = module + '.py'
# create a file with a list of 65000 elements
f = open(filename, 'w+')
f.write('d = [\n')
for i in range(65000):
f.write('"",\n')
f.write(']')
f.close()
# compile & remove .py file, we only need .pyc (or .pyo)
f = open(filename, 'r')
py_compile.compile(filename)
f.close()
os.unlink(filename)
# need to be able to load from current dir
sys.path.append('')
# this used to crash
exec('import ' + module)
# cleanup
del sys.path[-1]
for ext in '.pyc', '.pyo':
fname = module + ext
if os.path.exists(fname):
os.unlink(fname)
def test_failing_import_sticks(self):
source = TESTFN + ".py"
f = open(source, "w")
print("a = 1/0", file=f)
f.close()
# New in 2.4, we shouldn't be able to import that no matter how often
# we try.
sys.path.insert(0, os.curdir)
if TESTFN in sys.modules:
del sys.modules[TESTFN]
try:
for i in 1, 2, 3:
try:
mod = __import__(TESTFN)
except ZeroDivisionError:
if TESTFN in sys.modules:
self.fail("damaged module in sys.modules on %i. try" % i)
else:
self.fail("was able to import a damaged module on %i. try" % i)
finally:
sys.path.pop(0)
remove_files(TESTFN)
def test_import_name_binding(self):
# import x.y.z binds x in the current namespace
import test as x
import test.support
self.assert_(x is test, x.__name__)
self.assert_(hasattr(test.support, "__file__"))
# import x.y.z as w binds z as w
import test.support as y
self.assert_(y is test.support, y.__name__)
def test_import_initless_directory_warning(self):
with warnings.catch_warnings():
# Just a random non-package directory we always expect to be
# somewhere in sys.path...
warnings.simplefilter('error', ImportWarning)
self.assertRaises(ImportWarning, __import__, "site-packages")
def test_failing_reload(self):
# A failing reload should leave the module object in sys.modules.
source = TESTFN + ".py"
with open(source, "w") as f:
f.write("a = 1\nb=2\n")
sys.path.insert(0, os.curdir)
try:
mod = __import__(TESTFN)
self.assert_(TESTFN in sys.modules, "expected module in sys.modules")
self.assertEquals(mod.a, 1, "module has wrong attribute values")
self.assertEquals(mod.b, 2, "module has wrong attribute values")
# On WinXP, just replacing the .py file wasn't enough to
# convince reload() to reparse it. Maybe the timestamp didn't
# move enough. We force it to get reparsed by removing the
# compiled file too.
remove_files(TESTFN)
# Now damage the module.
with open(source, "w") as f:
f.write("a = 10\nb=20//0\n")
self.assertRaises(ZeroDivisionError, imp.reload, mod)
# But we still expect the module to be in sys.modules.
mod = sys.modules.get(TESTFN)
self.failIf(mod is None, "expected module to still be in sys.modules")
# We should have replaced a w/ 10, but the old b value should
# stick.
self.assertEquals(mod.a, 10, "module has wrong attribute values")
self.assertEquals(mod.b, 2, "module has wrong attribute values")
finally:
sys.path.pop(0)
remove_files(TESTFN)
if TESTFN in sys.modules:
del sys.modules[TESTFN]
def test_file_to_source(self):
# check if __file__ points to the source file where available
source = TESTFN + ".py"
with open(source, "w") as f:
f.write("test = None\n")
sys.path.insert(0, os.curdir)
try:
mod = __import__(TESTFN)
self.failUnless(mod.__file__.endswith('.py'))
os.remove(source)
del sys.modules[TESTFN]
mod = __import__(TESTFN)
ext = mod.__file__[-4:]
self.failUnless(ext in ('.pyc', '.pyo'), ext)
finally:
sys.path.pop(0)
remove_files(TESTFN)
if TESTFN in sys.modules:
del sys.modules[TESTFN]
def test_importbyfilename(self):
path = os.path.abspath(TESTFN)
try:
__import__(path)
except ImportError as err:
self.assertEqual("Import by filename is not supported.",
err.args[0])
else:
self.fail("import by path didn't raise an exception")
class TestPycRewriting(unittest.TestCase):
# Test that the `co_filename` attribute on code objects always points
# to the right file, even when various things happen (e.g. both the .py
# and the .pyc file are renamed).
module_name = "unlikely_module_name"
module_source = """
import sys
code_filename = sys._getframe().f_code.co_filename
module_filename = __file__
constant = 1
def func():
pass
func_filename = func.__code__.co_filename
"""
dir_name = os.path.abspath(TESTFN)
file_name = os.path.join(dir_name, module_name) + os.extsep + "py"
compiled_name = file_name + ("c" if __debug__ else "o")
def setUp(self):
self.sys_path = sys.path[:]
self.orig_module = sys.modules.pop(self.module_name, None)
os.mkdir(self.dir_name)
with open(self.file_name, "w") as f:
f.write(self.module_source)
sys.path.insert(0, self.dir_name)
def tearDown(self):
sys.path[:] = self.sys_path
if self.orig_module is not None:
sys.modules[self.module_name] = self.orig_module
else:
del sys.modules[self.module_name]
for file_name in self.file_name, self.compiled_name:
if os.path.exists(file_name):
os.remove(file_name)
if os.path.exists(self.dir_name):
shutil.rmtree(self.dir_name)
def import_module(self):
ns = globals()
__import__(self.module_name, ns, ns)
return sys.modules[self.module_name]
def test_basics(self):
mod = self.import_module()
self.assertEqual(mod.module_filename, self.file_name)
self.assertEqual(mod.code_filename, self.file_name)
self.assertEqual(mod.func_filename, self.file_name)
del sys.modules[self.module_name]
mod = self.import_module()
self.assertEqual(mod.module_filename, self.file_name)
self.assertEqual(mod.code_filename, self.file_name)
self.assertEqual(mod.func_filename, self.file_name)
def test_incorrect_code_name(self):
py_compile.compile(self.file_name, dfile="another_module.py")
mod = self.import_module()
self.assertEqual(mod.module_filename, self.file_name)
self.assertEqual(mod.code_filename, self.file_name)
self.assertEqual(mod.func_filename, self.file_name)
def test_module_without_source(self):
target = "another_module.py"
py_compile.compile(self.file_name, dfile=target)
os.remove(self.file_name)
mod = self.import_module()
self.assertEqual(mod.module_filename, self.compiled_name)
self.assertEqual(mod.code_filename, target)
self.assertEqual(mod.func_filename, target)
def test_foreign_code(self):
py_compile.compile(self.file_name)
with open(self.compiled_name, "rb") as f:
header = f.read(8)
code = marshal.load(f)
constants = list(code.co_consts)
foreign_code = test_main.__code__
pos = constants.index(1)
constants[pos] = foreign_code
code = type(code)(code.co_argcount, code.co_kwonlyargcount,
code.co_nlocals, code.co_stacksize,
code.co_flags, code.co_code, tuple(constants),
code.co_names, code.co_varnames, code.co_filename,
code.co_name, code.co_firstlineno, code.co_lnotab,
code.co_freevars, code.co_cellvars)
with open(self.compiled_name, "wb") as f:
f.write(header)
marshal.dump(code, f)
mod = self.import_module()
self.assertEqual(mod.constant.co_filename, foreign_code.co_filename)
class PathsTests(unittest.TestCase):
SAMPLES = ('test', 'test\u00e4\u00f6\u00fc\u00df', 'test\u00e9\u00e8',
'test\u00b0\u00b3\u00b2')
path = TESTFN
def setUp(self):
os.mkdir(self.path)
self.syspath = sys.path[:]
def tearDown(self):
shutil.rmtree(self.path)
sys.path = self.syspath
# http://bugs.python.org/issue1293
def test_trailing_slash(self):
f = open(os.path.join(self.path, 'test_trailing_slash.py'), 'w')
f.write("testdata = 'test_trailing_slash'")
f.close()
sys.path.append(self.path+'/')
mod = __import__("test_trailing_slash")
self.assertEqual(mod.testdata, 'test_trailing_slash')
unload("test_trailing_slash")
class RelativeImport(unittest.TestCase):
def tearDown(self):
try:
del sys.modules["test.relimport"]
except:
pass
def test_relimport_star(self):
# This will import * from .test_import.
from . import relimport
self.assertTrue(hasattr(relimport, "RelativeImport"))
def test_issue3221(self):
# Note for mergers: the 'absolute' tests from the 2.x branch
# are missing in Py3k because implicit relative imports are
# a thing of the past
def check_relative():
exec("from . import relimport", ns)
# Check relative import OK with __package__ and __name__ correct
ns = dict(__package__='test', __name__='test.notarealmodule')
check_relative()
# Check relative import OK with only __name__ wrong
ns = dict(__package__='test', __name__='notarealpkg.notarealmodule')
check_relative()
# Check relative import fails with only __package__ wrong
ns = dict(__package__='foo', __name__='test.notarealmodule')
self.assertRaises(SystemError, check_relative)
# Check relative import fails with __package__ and __name__ wrong
ns = dict(__package__='foo', __name__='notarealpkg.notarealmodule')
self.assertRaises(SystemError, check_relative)
# Check relative import fails with package set to a non-string
ns = dict(__package__=object())
self.assertRaises(ValueError, check_relative)
def test_main(verbose=None):
run_unittest(ImportTest, TestPycRewriting, PathsTests, RelativeImport)
if __name__ == '__main__':
# test needs to be a package, so we can do relative import
from test.test_import import test_main
test_main()
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